Everyone has a side they don't want others to see. This is an age of espionage, where nations across the globe are fully engaged in intelligence warfare, all while maintaining a facade of calm on the surface. Eastalis and Westalis have been locked in a cold war for over a decade. "Twilight," a top spy working for WISE, Westalis's intelligence agency dedicated to countering Eastalis, is assigned a critical mission: to monitor the movements of Donovan Desmond, the leader of Eastalis's National Unity Party. This dangerous man poses a significant threat to the fragile peace between the two nations. The operation is codenamed "Strix." To infiltrate the elite school attended by Desmond's son and gain access to its social circles, Twilight must form a family within a week. Adopting the identity of psychiatrist Loid Forger, he quickly assembles a household. Everything seems to be going according to plan—until he discovers that his "daughter," Anya, can read minds, and his "wife," Yor, is an assassin! Bound by their shared mission yet hiding their true identities from one another, the three begin their life together under one roof. Now, the heavy responsibility of preserving world peace rests on the shoulders of this makeshift family. What unfolds next is entirely unpredictable!